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When a European layout is active, and the user presses AltGr, Windows
generates a simulated VK_LCONTROL event alongside the VK_RMENU event.
This was causing the OSK to show LCtrl as depressed alongside RAlt, so
the OSK would show the wrong modifier layer, which was unhelpful and
confusing to the end user.
It is possible to detect the simulated VK_LCONTROL in the WH_KEYBOARD_LL
hook, because the scan code generated is 0x21D, instead of 0x1D.
Warning: this is not a documented value. (But, this 0x21D scan code is
not passed to the WM_KEYDOWN event!) Therefore, we use Keyman's existing
kmnLowLevelKeyboardProc to pass modifier key events on to the visual
keyboard.
This patch handles only this specific scenario, by watching for that
specific scan code in the new handler in the UfrmOSKOnScreenKeyboard
module, together with some minor refactoring so that it fits neatly.
A future improvement would be to have all modifier key processing go
through this new handler, and eliminate the timer-based polling of the
keyboard. However, there is some additional risk around missing events,
leading to 'stuck modifiers'.
Fixes: #14890
Build-bot: skip release:windows
Clarifies the confusing builder.inc.sh / build-utils.sh distinction by
giving the scripts more appropriate names. Most build scripts should use
builder-full.inc.sh; some helper scripts can use builder-basic.inc.sh.
Documented in resources/build/README.md.
Renames:
* resources/build/builder.inc.sh to resources/build/builder-full.inc.sh
* resources/build/build-utils.sh to resources/build/builder-basic.inc.sh
Other changes:
* Moves Android-specific functions out of builder-basic.inc.sh and into
android/build.sh.
* Renames functions in builder-basic.inc.sh
More functions may be moved from builder-basic.inc.sh into utils.inc.sh
or other scripts in the future.
Fixes: #14065
Build-bot: build all
Test-bot: skip
Removed the redundant thread check guard on load modifer. Added guard
to reading the option. Also fixed some formating. and made the load
modifier private.
Fixes: #13440
This refactors the cached of the right modifier key used in hotkeys
option. In the lowlevelhook you couldn't reset the cached value.
It is now part of the hotkeys class which is more logical encapsulation
the logic assocaited with the hotkeys.
